Recovery of 2,6-dialkyl-naphthalene isomers

Details Recovery of 2,6-dialkyl-naphthalene isomers Recovery of 2,6-dialkyl-naphthalene isomers

1988-02-04

1990-02-13

Caldarola, Glenn

Superconductor technology: apparatus, material, process

Material, per se, process of making same

Stock:

585813, 585817, C07C 714

Patent

active

049007173

ABSTRACT:
In a process for selective crystallization of 2,6-dialkyl-naphthalene selected from the group consisting of methyl-n-propyl-naphthalene, methyl isopropyl-naphthalene, ethyl-isopropyl-napthalene, ethyl-n-butyl-naphthalene, di-n-propyl-naphthalene, diisopropyl-naphthalene, methyl-amyl-naphthalene, ethyl-amyl-naphthalene, propyl-amyl-naphthalene, di-n-butyl-naphthalene and diisobutyl-naphthalene from their isomer mixtures from a polar solvent solution, the improvement comprising effecting the crystallization with constant stirring at a temperature from 25.degree. to -30.degree. C. to obtain the 2,6-dialkyl-naphthalene at least 95% pure.

REFERENCES:
patent: 3202726 (1965-08-01), Malmberg et al.
patent: 3235615 (1966-02-01), Allen et al.
patent: 3400548 (1968-09-01), Drayer
patent: 3485885 (1969-12-01), Peterkin et al.
patent: 3590091 (1971-06-01), Skarada et al.
patent: 3798280 (1974-03-01), Shimada et al.

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